You just cannot except to produce great quality work just without practice.
In these two weeks you have to practice as much as possible.
Once you find good essays and some great essay writers, start following them.
Read all their essays that they have written, observe their writing style and try adapting it to your writing style.
As a student at a UK university, the biggest challenge you will find in essay writing is to make each one a little bit better than the last, especially if you are required to write them regularly.
So how do you take your essays to the next level and go from great to brilliant?
Read as many as you can from fellow students and academics on a variety of subjects and different disciplines and as you do so, be critical: what do you like and dislike about them? Is the argument a balanced one, with points adequately supported with evidence?
A good vocabulary will allow you to express exactly what you mean, as clearly and concisely as possible.
Today we have hundreds and thousands of essay writers who specifically just write essays and earn money doing this work either full time or part time.
Many of these are experienced and skilled writers but at the time there are many writers who are new or who are having very little experience in essay writing, so they badly needs to improve their essay writing skills.